Lathe attachment for turning and finishing crank-shafts.



. G. E. WILDER. LATHE ATTAGHMENTTOR TURNING AND FINISHING CRANK SHAFTS.

APPLIGATION FILED FEB.13, 1913.

Am 1 9 1 2 e n H J d 6 m 6 t a P 3 SHEETS-SHEBT 1 W'QLUESEES O. E. WILDER. LATHE ATTACHMENT FOR TURNING AND FINISHING CRANK SHAFTS. APPLICATION FILED PEB.18,1913

98,654 Patented June 2, 1914.

3 SHEBTS-SHEET 2.

LATHE ATTACH o. 3. WILDER. MENT FOR TURNING AND FINISHING CRANK SHAFTS.

APPLIGATION FILED FBB.13,1913.

Patented June 2, 1914.

3 SHEETS-$111131 3.

EEEES- ctrn'ron n. pan, or ERIE, PENNSYLVANIA.

LATHE ATTAGHMENT FOR TURNING AND FINISHING CRANK-SHAFTS.

Specification of Letters Patent. Application filed February 13, 1913.

Patented June 2, 1914. Serial No. 748,138.

To all whom it may concern: Be it known that l, Unmron E. Wmonn,

a citizen of the United States, residing at Erie, in the county of Erie and State of which fits in between'the Pennsylvania, have invented certain new and useful Improvements in Lathe Attachments for Turning and Finishing Crank- Shafts; and I do hereby declare the follow ing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification.

My invention relates to machines adapted v to turn and grind crank-pins, and has for itsobject the provision of mechanism adapted to be removably mounted upon an ordinary lathe, by means of which the crank-pins, or wrist-pins, of multiple crank-shafts can be turned or ground without the necessity of changing the position of the crank-shaft in the lathe, when changing the tool from one crank to another.

The features of my invention are hereinafter fully set forth and described and are illustrated in the accompanying drawings, in which Figure 1, shows a side elevation of my improved wrist-pin turning mechanism, in place on a lathe. Fig. 2, is a front elevation of the same, looking in the direction of the arrow in Fig. 1. Fig. 3, is a vertical, central section of the same Fig. A, is a rear view, looking in the direction of the arrow 2, in Fig. 1, Fig. 5, is a horizontal section of.

the same, on the line w-w, in Fig. 4, looking downward.

In these drawings, A, indicates the lathe-- bed, A, the face-plate, and A, the tail-stock of turning or grinding lathe, which parts are of general and ordinary construction. Within the faceplate A, and tail-stock A insert a journal-pin, A, (see Figs. 3 and 5), of conical shape, to fit the central openings in the face-plate A, and tail-stock A The journal-pins Afl'are provided with a collar, a and with a cylindrical portion A (see Fig. 3), and with a screw-threaded stud 0:. Upon the cylindrical portion A", l mount my improved crank-shaft fastening, which consists of the frame B, having a hub B, which fits upon the portion A of the journal-pin. This frame B, is provided with a counterweight arm B and wlth slide-ways B and is provided with a slot B and with the slots B, (see Fig. 4).

Upon the face of this frame B, I place a sliding member G, slide-ways B of the. frame B, and is provided with a rearwardly projecting portion C and G which extends rearwardly through the slot B in the frame B". The front of the memberC,

is provided with a circular index plate C within which plate I make a depression 0, and a central opening a, which opening 0', extends from said depression 0', backwardly through the member 0. Upon the face of the index-plate Cf, I place an index clampplate D, which has a circular projection (Z on the rear side thereof, adapted to fit into the depression 0, in the index-plate C. This index clamp-plate D, is also provided with a central opening therethrough, through which opening member 0, I place a clamp-bolt E, which bolt is provided with a nut e, by means of which the index-plate C and the index clamp-plate D, may be firmly clamped together. Upon the face ofthe index clampplate- D, I integrally form shaft-gripping vise F, which is provided with a semi-circular recess concentric with the bolt E, and hinged upon one end of this visc-jaw F, by means of the pivot f, I place another vise-jaw F. For clamping these jaws upon a shaft G, I provide a bolt l-I, one end of which is pivoted in the lower jaw F, by means of the pivot f, and the other end of said bolt extends upwardly through the slot in the free end of the jaw F, and is provided with a nut H by means of which the swinging jaw F may be clamped upon a shaft G, when desired.

To secure the frame B, upon the journal pin A, I place a screw-collar a upon the screw-stud a. To prevent dust and dirtfrom entering about this journal pin .l pro vide a plate a which is secured to the frame B, by means of the screws a In order to give radial adjustment to the member C and the mechanism secured there on, I provide a screw J, which extends inwardly from the frame B, through a screwthreaded opening in the arm C, and is provided with a collar J to prevent longitudinal movement thereof.

To provide for the rotation of the index clamp-plate D, upon the index-plate C and to control the same, I provide openings K, in the index-plate, which correspond with one half of a and the opening 0 in the dex-plate C the centers of the wrist-pin G, in the crankshaft G,to be ground, and I provide the index clamp-plate D, with a sliding bolt L, adapted to enter the openings K, in the inas the index 0 amp-plate D, is rotated thereon, and stop the rotation thereof at the required points. This sliding bolt L, is provided with a spring Z, to hold the same normally in a forward position, and with a head Z, by which it may be withdrawn, and a stud P, which may be turned to engage the shoulder Z to retain said bolt L, out of engagement with the index-plate when desired. I also provide clamp bolts M, which extend through the slots B in the frame B, into the member 0, by means of which the slidable member C, may be firmly clamped to the frame B, after it has been adjusted to the proper position by the operation of the screw J On the counter weight arm 13, I place sufficient counter weight N, to balance the mechanism hereinbefore described and work clamped therein during the operation of the machine.

In order ,to secure perfect parallelism between the members" placed on the face-plate A, and the tail-stock A I provide in the weight arm B a-- stop-opening O, and I secure upon the lathe-bed ,g, stop-supports I, in which I place sliding ,olts P, which are adapted to be pressed forward and extend into the opening 0, in the arm B of each of the members, and hold them in exact parallelism during the removal of a shaft G, from the'clamping-jaws F, and F, and the placing of another shaft therein and'clamping'the same. The member placed upon the journal-pin of the face-plate A, is caused to rotate with said face-plate by means of a strap Q, (see Fig. 4), one end of which is bolted to the arm B by means of a bolt 9, and the other end of which is bolted to the face-plate A, by means of a bolt 9, so that the two bodies will rotate in unison.

In operation, the crank G, is placed in the vises F-F, and one of the cranks G, thereon, turned therein until it is in proper alinement with the center of rotation, as indicated by the broken line B, in Fig. l, in

which position the shaft G, is firmly clamped by means of the nut H, and bolt H, at

each end of the shaft. Then after the first crank-pin G, has been finished, the sliding bolt L, is withdrawn from its index opening K, in the index-plate C the clamp-nut e, is loosened, and the crank-shaft G, together with its clamping-jaws F, and F, and the index clamp-plates D, at each end thereof, are rotated until the spring-pressed sliding bolts L, enter the next successive stop opening K, which will bring another one of the crank-pins G, in line with the center of rotation, as indicated by the broken line B,

' determined points,

in Fig. 1, when the clamp-nuts e, are again tightened up, and the process of grinding or turning the crank-pin G is again repeated. This operation isrepeated for each crankpin in the crank-shaft.

Fig. 1, of the drawings does not show a cutting or grinding tool in position thereon,

but it is obvious that any of the well known forms of such tools could be used with my improved mechanism.

Having thus fully shown and described my invention, so as to enable others to construct and operate the same, what I claim as new and desire to secure by Letters-Patent 1. The combination in a device of the class described, of a face-plate, a tail-stock, journal-pins therein, arms mounted on said journal-pins, slide-ways on said arms, a radially slidable'member mounted in said slide-ways, means to secure said slidable member in adjusted position in said slide-ways, clampjaws rotatably mounted on said radially slidable member, means to stop the rotation of said clamping-jaws upon said. slidable member, and means to cause said arms to revolve upon said journal-pins in unison with said face-plate, substantially as set forth.

2. The combination in a device of the class described, of a face-plate,'a tail-stock, journal-pins therein, arms mounted on said journal-pins having slots therein, slide-ways on said arms, a radially slidable member mounted between said slide-ways, an arm on said slidable member extending through one of said slots, an adjusting screw engaging said arm, clamping-bolts 111 the other of said slots to secure said slidable member in adjusted position, clamp-jaws pivoted on said slidable member, means to stop the rotation of said clamp-j aws upon their pivot at preand means to cause said arms to rotate upon said journal-pins, substantially as Set forth.

3. The combination in a device, of the class described, of a face-plate, a tail-stock, ournal-pins therein, clamping-jaws mounted on said journal-pins upon independent axes eccentric to said journal pins, means to stop the rotation of said clamp-jaws upon their own axes at predetermined points, means to adjust the axes of the clamp-jaws mounted upon said journal-pins in parallelism to each other, and means adapted to cause said clamp-jaws to revolve upon said journal-pins in unison with said face-plate, substantially as set forth.

In testimony whereof I affix my signature, in presence of two witnesses.

CLINTON E. WILDER.

Witnesses:

H. M. STURGEON, G. J. MEAD. 

